Stock Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Dec. 29, 2012
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	1,224,801	1,570,543
Options outstanding, Weighted Average Exercise Price	$ 3.92	$ 3.64
Options outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 8 months 23 days
Options outstanding, Aggregate Intrinsic Value	$ 2,706
Options vested and expected to vest, Number of Shares	1,155,031
Options vested and expected to vest, Weighted Average Exercise Price	$ 3.89
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years)	3 years 6 months 22 days
Options vested and expected to vest, Aggregate Intrinsic Value	2,596
Options exercisable, Number of Shares	789,589
Options exercisable, Weighted Average Exercise Price	$ 3.67
Options exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 5 months 1 day
Options exercisable, Aggregate Intrinsic Value	$ 1,967